BOONSBORO -- A Frederick, Md., man was seriously injured in a head-on collision on U.S. 40 near Boonsboro on Sunday, Maryland State Police said.

Andrew Thomas Marker, 28, was ejected through the sunroof of his SUV when it crashed into another car east of Greenbrier State Park, Trooper 1st Class Dave Matthews said. Marker, who was unconscious after the crash, was flown to Washington County Hospital, where he was listed in serious condition Monday morning, a spokeswoman there said.

Marker was charged with driving under the influence, Matthews said.

Marker was westbound on U.S. 40 at about 5:25 p.m. when he swerved into oncoming traffic near the Boonsboro Mountain Road intersection, Matthews said. There was another westbound car waiting to make a left turn, he said.

"When (Marker) came over the mountain, I guess he panicked because he saw him turning left, and instead of going around to the right, he tried to pass him on the left," Matthews said.

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When Marker crossed into the eastbound lane, his Chevrolet Blazer collided head-on with an eastbound Pontiac Grand Am, Matthews said. The Grand Am went under the bumper of the Blazer, vaulting the SUV into the air, Matthews said.

Marker flew out of the sunroof and landed on his face on the road, and the Blazer landed on its side and caught fire, Matthews said.

"If he didn't have (the sunroof), he may have been trapped inside the vehicle and burned," Matthews said.

The three occupants of the Grand Am also were taken to Washington County Hospital, Matthews said. The driver, Felipe Alexander Alfaro, 42, and passengers Ingrid Alfaro, 18, and Dimora Bonilla, 23, all of Gaithersburg, Md., were being assessed in the emergency room Sunday night, a nursing supervisor said. All three were stable, but Ingrid Alfaro's condition was guarded, the nursing supervisor said.

The Gaithersburg residents were headed home from a family picnic at Greenbrier State Park, Matthews said.